CN111315574A - 发泡树脂成形品 - Google Patents
发泡树脂成形品 Download PDFInfo
- Publication number
- CN111315574A CN111315574A CN201880062617.2A CN201880062617A CN111315574A CN 111315574 A CN111315574 A CN 111315574A CN 201880062617 A CN201880062617 A CN 201880062617A CN 111315574 A CN111315574 A CN 111315574A
- Authority
- CN
- China
- Prior art keywords
- foamed resin
- mass
- resin
- resin layer
- molded article
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/34—Chemical features in the manufacture of articles consisting of a foamed macromolecular core and a macromolecular surface layer having a higher density than the core
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Abstract
本发明涉及一种发泡树脂成形品(1),其具有发泡树脂层(30)和包覆发泡树脂层(30)的非发泡树脂层(50),所述发泡树脂层(30)包含第一树脂和发泡剂,所述第一树脂为包含橡胶成分、氰化乙烯基类单体单元和芳香族乙烯基类单体单元的共聚物,非发泡树脂层(50)包含第二树脂,所述第二树脂为包含橡胶成分、氰化乙烯基类单体单元和芳香族乙烯基类单体单元的共聚物,相对于所述第二树脂的总质量,通过热解气相色谱质量分析法(PGC/MS)而求得的非发泡树脂层(50)的所述橡胶成分的含量为1质量%以上30质量%以下。
Description
技术领域
本发明涉及在排水管等的连接中使用的发泡树脂成形品。
本申请主张基于2017年9月29日在日本申请的日本特愿2017-189562号的优先权,将其内容援用于此。
背景技术
以往,通常通过用玻璃棉等的保温材料包覆包含钢管、合成树脂管的配管周围,而防止配管周围的结露等。
然而,在所述以往的方法中,由于与配管的操作分开,需要卷绕或者覆盖保温材料的操作,因此,操作效率差,存在在狭窄的操作空间中不能进行操作的情况。
因此,提出了具有设为隔热层的发泡树脂层的树脂制的配管、管接头。通过设置隔热层,而即使在配管施工后不用保温材料包覆,也可以防止结露。
专利文献1提出了附有隔热层的管接头,其具有下述构成:在主体部的内部具备包含发泡树脂的隔热层,通过注塑成形而使围绕该隔热层的主体部的内外壁与连接部一体成形。作为可以在专利文献1的管接头中使用的树脂,可举出:聚氯乙烯、丙烯腈-丁二烯-苯乙烯共聚物(ABS树脂)、聚乙烯、聚丙烯等,在当前的产品中,使用耐冲击性、耐热性优异的ABS树脂。
现有技术文献
专利文献
专利文献1:日本专利第3699579号公报
发明内容
发明所解决的技术问题
就ABS树脂而言,作为初期性能,虽然耐冲击性、耐热性优异,但是耐化学品性较差。因此,就ABS树脂制的接头而言,当排水配管中存在有机溶剂、油分时,存在主体部的内外壁劣化,隔热性降低的风险。
因此,本发明的目的是提供隔热性和耐化学品性优异的发泡树脂成形品。
解决问题的技术手段
反复深入研究的结果,本发明人等发现,如果使构成发泡树脂成形品的ABS树脂等中包含的丁二烯等的橡胶成分的含量减少,则能够提高耐化学品性。
此外发现,当含有丙烯酸类树脂时,能够使发泡树脂成形品透明,能够容易地肉眼确认配管和管接头的连接部分。
为了解决所述问题,而本发明具有以下的方式。
[1]、一种发泡树脂成形品,其具有:
发泡树脂层,其包含第一树脂和发泡剂,所述第一树脂为包含橡胶成分、氰化乙烯基类单体单元和芳香族乙烯基类单体单元的共聚物;和
非发泡树脂层,其包覆所述发泡树脂层,其中,
所述非发泡树脂层包含第二树脂,所述第二树脂为包含橡胶成分、氰化乙烯基类单体单元和芳香族乙烯基类单体单元的共聚物,
相对于所述第二树脂的总质量,通过热解气相色谱质量分析法(PGC/MS)而求得的所述非发泡树脂层的所述橡胶成分的含量为1质量%以上30质量%以下。
[2]、根据[1]所述的发泡树脂成形品,其中,
所述非发泡树脂层进一步包含丙烯酸类树脂。
发明效果
如果基于本发明的发泡树脂成形品,则隔热性和耐化学品性优异。
附图说明
[图1]是表示本发明的一个实施方式的发泡树脂成形品的侧面图。
[图2]是图1所示的发泡树脂成形品的纵向截面图。
[图3]是表示本发明的其他实施方式的发泡树脂成形品的部分截面图。
[图4]是表示伸缩疲劳试验的配管结构的侧面图。
具体实施方式
[发泡树脂成形品]
以下,对于基于本发明的实施方式的发泡树脂成形品,基于附图进行说明。
如图1所示,基于本实施方式的发泡树脂成形品1,将排水管的连接中使用的接头(通常被称为“弯头”(elbow)的L形的配管接合接头)作为一个实例。发泡树脂成形品1具备在内部具有弯曲的流路,在两端具有开口部12a和开口部12b的主体部10。发泡树脂成形品1具备:围绕主体部10的开口部12a的边缘的圆筒状的接受口部20a和围绕主体部10的开口部12b的边缘的圆筒状的接受口部20b。主体部10、接受口部20a和接受口部20b形成为一体。
图2是图1所示的发泡树脂成形品1的纵向截面图。如图2所示,主体部10具备发泡树脂层30和非发泡树脂层50。发泡树脂层30的两个表面被非发泡树脂层50覆盖。接受口部20a和接受口部20b由非发泡树脂层5形成。就发泡树脂层30而言,其一部分咬入接受口部20a的非发泡树脂层50。此外,就发泡树脂层30而言,其一部分咬入接受口部20b的非发泡树脂层50。
主体部10的开口部12a的边缘形成有挡块13a。从接受口部20a的接受口端部22a至挡块13a的长度为L1。
接受口部20a的挡块13a附近的厚度为d1。
接受口部20b的结构与接受口部20a的结构同样。
基于本发明的实施的方式的发泡树脂成形品可以是接头(通常被称为“三通”(tees)的3方向分支的T形的配管接合接头)。
如图3所示,发泡树脂成形品2具有第一管轴O1和第二管轴O2。两个管轴O1和O2为直线状并且相互以90.0°~91.1°的角度交叉。
发泡树脂成形品2具有在内部具有流路(例如排水的流路)的管状的主体部210、和与该主体部210的开口部形成为一体的3个接受口部220a、220b和220c。为了插入连接带有发泡层的管部件,而使3个接受口部220a、220b和220c的内径成为比主体部210的内径大的内径。
发泡树脂成形品2构成分别在形成直管的主体部210的两端212a、212b和在第二管轴O2方向上开口的分支端部212c的3个位置的开口部设置有接受口部220a、220b、220c的三通部件。
在主体部210中,在隔着第一管轴O1而与分支端部212c相对的位置设置有设为成形时被注塑的位置的注塑口部214。
挡块213a形成在主体部210的开口端部212a的边缘,与主体部210的内圆周面连接。挡块213c形成在主体部210的分支端部212c的边缘。
主体部210具备发泡树脂层230和非发泡树脂层250。发泡树脂层230的两个表面被非发泡树脂层250覆盖。接受口部220a、接受口部220b和接受口部220c由非发泡树脂层250形成。
从接受口部220a的接受口端部222a至主体部210的开口端部212a的长度为L2。长度L2等于从接受口端部222a至挡块213a的长度。接受口部220a的挡块213a附近的厚度为d2。接受口部220b的结构与接受口部220a的结构同样。即,从接受口端部222b至开口端部212b的长度为L2。
此外,从接受口部220c的接受口端部222c至主体部210的分支端部212c的长度为L3。长度L3等于从接受口端部222c至挡块213c的长度。接受口部220c的挡块213c附近的厚度为d3。
<发泡树脂层>
发泡树脂层30是使发泡性树脂组合物发泡并成形而形成的。本发明的发泡树脂成形品1通过具有发泡树脂层30,而具有优异的隔热性。
发泡树脂层30中的发泡倍率优选为1.0倍以上8.0倍以下,更优选为1.1倍以上5.0倍以下,进一步优选为1.2倍以上3.0倍以下。
通过将发泡倍率设在所述数值范围内,而能够赋予较高的隔热性能。
发泡倍率可以根据树脂的种类或量、发泡剂的种类或量、制造条件等而调整。
需要说明的是,发泡倍率可以通过以下的方法而测定。
(发泡倍率的测定方法)
从发泡树脂成形品1的主体部10切出圆周方向10mm以上,轴方向50mm,通过铣刀而切削非发泡树脂层50,将仅将发泡树脂层30加工为长度约50mm的板状而得到的物质设为试验片。需要说明的是,就试验片而言,以在圆周方向上均等地分成4份的点为中心而制成试验片。
根据JIS K 7122,在23℃±2℃下使用排水型比重计而将试验片的表观密度确定至小数点后3位,通过下述式(1)而算出发泡倍率。
M=γc/γ···(1)
[式(1)中,m为发泡倍率,γ为发泡树脂层的表观密度(g/cm3),γc为发泡树脂层的未发泡时的密度(g/cm3)。需要说明的是,发泡树脂层的未发泡时的密度可以由发泡树脂层熔融而成的物质进行测定。]
在发泡树脂层30中,形成有多个气泡,在气泡壁上实际上不存在孔,多个气泡的至少一部分成为彼此不连通的独立气泡。独立气泡率优选为85%以上,更优选为90%以上。上限值没有特别限定,实际上设为99%以下。如果在所述数值范围内,则能够长期持续保持较低的热传导率,隔热性更优异。
独立气泡率基于JIS K 7138:2006而进行测定。
<发泡性树脂组合物>
本实施方式的发泡性树脂组合物包含第一树脂和发泡剂,所述第一树脂是包含橡胶成分、氰化乙烯基类单体单元和芳香族乙烯基类单体单元的共聚物。
本说明书中,“单元”是指,源自聚合前的单体化合物(单体)的结构部分,例如,“氰化乙烯基类单体单元”是指“源自氰化乙烯基单体(丙烯腈)的结构部分”。聚合物中的各单体单元的含有比例相当于该聚合物的制造中使用的单体混合物中的该单体的含有比例。
此外,“(甲基)丙烯酸”是指“丙烯酸”和“甲基丙烯酸”的一者或两者,“丙烯腈”是指“丙烯腈”和“甲基丙烯腈”的一者或两者。
(第一树脂)
第一树脂是包含橡胶成分、氰化乙烯基类单体单元和芳香族乙烯基类单体单元的共聚物。
包含橡胶成分、氰化乙烯基类单体单元和芳香族乙烯基类单体单元的共聚物是在橡胶成分的存在下,使芳香族乙烯基类单体和氰化乙烯基类单体聚合而得到的树脂。
在本说明书中,橡胶成分是指,成为聚丁二烯、聚异戊二烯等的二烯类橡胶的原料、丙烯酸类橡胶的原料的单体成分。
作为橡胶成分,如果为二烯类橡胶,则可举出:丁二烯、异戊二烯、乙烯、丙烯等的二烯类橡胶的单体或其聚合物,如果为丙烯酸类橡胶,则可举出:丙烯酸乙酯、丙烯酸丁酯、丙烯酸丁氧基乙酯和丙烯酸甲氧基乙酯等的丙烯酸酯单体或其聚合物。
作为氰化乙烯基类单体,可举出:丙烯腈、甲基丙烯腈等,优选丙烯腈。
作为芳香族乙烯基类单体,可举出:苯乙烯、α-甲基苯乙烯、β-甲基苯乙烯、4-甲基苯乙烯、β-溴苯乙烯等,优选苯乙烯、α-甲基苯乙烯。
作为第一树脂的具体例,可举出:丙烯腈-丁二烯-苯乙烯共聚物(ABS树脂)、丙烯腈-乙烯丙烯二烯-苯乙烯共聚物(AES树脂)、丙烯腈-丙烯酸类橡胶-苯乙烯共聚物(AAS树脂)等,进一步,可以混合这些。
第一树脂的橡胶成分的含量没有特别限定,相对于第一树脂的总质量,优选为1质量%以上30质量%以下。
就第一树脂而言,相对于第一树脂的总质量,氰化乙烯基类单体单元的含量优选为10质量%以上50质量%以下,更优选为15质量%以上45质量%以下。当氰化乙烯基类单体单元的含量为所述下限值以上时,能够提高拉伸强度。当氰化乙烯基类单体单元的含量为所述上限值以下时,能够提高冲击强度。
就第一树脂而言,相对于第一树脂的总质量,芳香族乙烯基类单体单元的含量优选为15质量%以上60质量%以下,更优选为20质量%以上50质量%以下。当芳香族乙烯基类单体单元的含量为所述下限值以上时,能够提高压入硬度。当芳香族乙烯基类单体单元的含量为所述上限值以下时,能够提高冲击强度。
第一树脂可以包含除氰化乙烯基类单体单元和芳香族乙烯基类单体单元之外的任意的单体单元,作为其实例,可举出:聚碳酸酯树脂、其单体。
第一树脂中的各成分的含量可通过使用了热解气相色谱质量分析法(PGC/MS)的分析而求得。
以下表示使用了PGC/MS的测定条件的实例。
[测定条件]
·装置
热分解装置:PY-2020iD(FRONTIER LABORATORIES)。
气相色谱仪:GC 2010(岛津制作所)。
质量分析装置:GCMS-QP 2010(岛津制作所)。
·热分解条件
热分解温度:550℃。
界面温度:250℃。
·气相色谱仪条件。
载体流速:1ml/min(He)。
分流比:100:1。
烘箱温度:40℃(3min)-320℃(10min)。
·质量分析条件
界面温度:250℃。
离子化温度:220℃。
质量范围:28~700m/z。
电压:1.2kV。
对通过PGC/MS的测定而算出第一树脂中的各成分的含量的方法进行说明。
首先,通过热解气相色谱而使构成第一树脂的各成分进行热分解·分离,得到将各成分作为峰记录的热分解图案(热解图)。接下来,对于热分解图案的各峰,根据通过质量分析装置而得到的质谱而确定丙烯腈、橡胶成分、苯乙烯的各成分。
此处,由于丙烯腈、橡胶成分、苯乙烯的各成分基于热分解的解聚率(聚合物分解成单体的比例)不同,因此,将热解图中的各峰的面积(X)除以基于热分解的各成分的解聚率(Y)而得到面积设为各成分的峰面积(Z)。各成分的解聚率(Y)分别为,丙烯腈:0.15,橡胶成分:0.10,苯乙烯:1.0。此外,例如,在作为其他树脂而包含聚甲基丙烯酸甲酯等的丙烯酸类树脂的情况下,丙烯酸类树脂的解聚率为1.0。
并且,将热分解图案的各成分的峰面积(Z)相对于总和(T)的比(Z/T)设为第一树脂中的各成分的含量(质量%)。
表1表示对包含丙烯酸类树脂的丙烯腈-丁二烯-苯乙烯共聚物(ABS树脂)进行PGC/MS测定而得到的各成分的含量的一个实例。在表1中,“保留时间”意味着各成分热分解并作为热解图的峰而出现的时间。“样品量”是分析中提供的ABS树脂的质量。
在发泡性树脂组合物中,相对于发泡性树脂组合物的总质量,第一树脂的含量优选为45质量%以上90质量%以下,更优选为50质量%以上85质量%以下。
本实施方式的发泡性树脂组合物可以含有除第一树脂之外的其他树脂。
作为其他树脂,例如可举出:聚丙烯酸甲酯、聚丙烯酸乙酯、聚丙烯酸缩水甘油酯、聚甲基丙烯酸甲酯、聚甲基丙烯酸乙酯、聚甲基丙烯酸缩水甘油酯等的丙烯酸类树脂、聚乙烯基树脂、聚酯树脂、聚醚树脂、聚酰亚胺树脂等。这些可以单独使用,也可以组合使用2种以上。
在发泡性树脂组合物中,相对于发泡性树脂组合物中的树脂的总质量,第一树脂的含量优选为70质量%以上100质量%以下,更优选为85质量%以上100质量%以下。
(发泡剂)
作为发泡剂,可以使用挥发性发泡剂、分解型发泡剂的任一种。
作为挥发性发泡剂,例如可举出:脂肪族烃、脂环族烃、卤代烃、醚、酮等。其中,作为脂肪族烃,例如可举出:丙烷、丁烷(正丁烷、异丁烷)、戊烷(正戊烷、异戊烷等)等,作为脂环族烃,例如可举出:环戊烷、环己烷等。作为卤代烃,例如可举出:三氯氟甲烷、三氯三氟乙烷、四氟乙烷、氯二氟乙烷、二氟乙烷等的卤代烃等的1种或2种以上。进一步,作为醚,例如可举出:二甲醚、二乙醚等,作为酮,例如可举出:丙酮、甲基乙基酮等。
作为分解型发泡剂,例如可举出:碳酸氢钠(Sodium bicarbonate)、碳酸钠、碳酸氢铵、亚硝酸铵、叠氮化合物、硼氢化钠等的无机类发泡剂、偶氮二甲酰胺、偶氮二碳酸钡、二亚硝基五亚甲基四胺等的有机类发泡剂。
其它,可以使用二氧化碳、氮气、空气等的气体作为发泡剂。
从发泡性能优异的观点出发,优选分解型发泡剂,其中,更优选碳酸氢钠、偶氮二甲酰胺。
这些可以单独使用,也可以组合使用2种以上。
相对于第一树脂100质量份,发泡剂的含量优选为0.1质量份以上8质量份以下,更优选为1质量份以上5质量份以下,进一步优选为1质量份以上3质量份以下。
本发明的发泡性树脂组合物在不损害本发明的效果的范围内,可以包含除第一树脂、发泡剂之外的其他成分(任意成分)。
相对于第一树脂100质量份,任意成分的含量优选为50质量份以下,更优选为30质量份以下,进一步优选为20质量份以下。
本发明的发泡性树脂组合物可以包含第一树脂、发泡剂和任意成分。发泡性树脂组合物可以是预先混合所有成分而得到的混合物,也可以是通过在成形机内混合所有成分的一部分或全部的方式。预先混合所有成分而得到的混合物可以是粉状,也可以是颗粒状。
<非发泡树脂层>
本实施方式的非发泡树脂层通过使非发泡性树脂组合物成形而成。本发明的发泡树脂成形品通过具有非发泡树脂层,而能够提高发泡树脂成形品的强度。
非发泡树脂层包覆发泡树脂层。
<非发泡性树脂组合物>
本实施方式的非发泡性树脂组合物包含第二树脂,所述第二树脂是包含橡胶成分、氰化乙烯基类单体单元和芳香族乙烯基类单体单元的共聚物。
(第二树脂)
第二树脂是包含橡胶成分、氰化乙烯基类单体单元和芳香族乙烯基类单体单元的共聚物。
第二树脂可以与第一树脂相同,也可以不同。
就第二树脂而言,相对于第二树脂的总质量,橡胶成分的含量为1质量%以上30质量%以下,优选为1质量%以上25质量%以下,更优选为3质量%以上20质量%以下,进一步优选为5质量%以上15质量%以下,特别优选为5质量%以上10质量%以下。当橡胶成分的含量为所述下限值以上时,易于提高发泡树脂成形品的强度。当橡胶成分的含量为所述上限值以下时,易于进一步提高耐化学品性。
就第二树脂而言,相对于第二树脂的总质量,氰化乙烯基类单体单元的含量优选为10质量%以上50质量%以下,更优选为15质量%以上45质量%以下。当氰化乙烯基类单体单元的含量为所述下限值以上时,能够提高拉伸强度。当氰化乙烯基类单体单元的含量为所述上限值以下时,能够提高冲击强度。
就第二树脂而言,相对于第二树脂的总质量,芳香族乙烯基类单体单元的含量优选为15质量%以上60质量%以下,更优选为20质量%以上50质量%以下。当芳香族乙烯基类单体单元的含量为所述下限值以上时,能够提高压入硬度。当芳香族乙烯基类单体单元的含量为所述上限值以下时,能够提高冲击强度。
第二树脂中的各成分的含量可通过使用了热解气相色谱质量分析法(PGC/MS)的分析而求得。作为测定条件,可以在与第一树脂同样的条件下而进行测定。
在非发泡性树脂组合物中,相对于非发泡性树脂组合物的总质量,第二树脂的含量优选为45质量%以上90质量%以下,更优选为50质量%以上85质量%以下。
本实施方式的非发泡性树脂组合物可以含有除第二树脂之外的其他树脂。
作为其他树脂,例如可举出:聚乙烯基树脂、聚酯树脂、聚醚树脂、丙烯酸类树脂、聚酰亚胺树脂等。这些可以单独使用,也可以组合使用2种以上。
优选本实施方式的非发泡性树脂组合物进一步含有丙烯酸类树脂。作为丙烯酸类树脂,例如可举出:丙烯酸酯的聚合物、甲基丙烯酸酯的聚合物。作为丙烯酸酯的聚合物,可举出:聚丙烯酸甲酯,聚丙烯酸乙酯,聚丙烯酸缩水甘油酯等。作为甲基丙烯酸酯的聚合物,可举出:聚甲基丙烯酸甲酯,聚甲基丙烯酸乙酯,聚甲基丙烯酸缩水甘油酯等。
相对于非发泡性树脂组合物中的树脂的总质量,丙烯酸类树脂的含量优选为20质量%以上60质量%以下,更优选为30质量%以上50质量%以下。当丙烯酸类树脂的含量在所述数值范围内时,易于提高发泡树脂成形品的强度和透明度。
相对于非发泡性树脂组合物的总质量,丙烯酸类树脂的含量优选为10质量%以上55质量%以下,更优选为20质量%以上50质量%以下。
含有第二树脂和其它的树脂的非发泡性树脂组合物中的各成分的含量可通过使用了热解气相色谱质量分析法(PGC/MS)的分析而求得。作为测定条件,可以在与第一树脂同样的条件下进行测定。第二树脂中的各成分的含量可以通过与第一树脂中的各成分的含量相同的算出方法而算出。
需要说明的是,丙烯腈、橡胶成分、苯乙烯、丙烯酸类树脂的解聚率分别为,丙烯腈:0.15,橡胶成分:0.10,苯乙烯:1.0,丙烯酸类树脂:1.0。
在非发泡性树脂组合物中,相对于非发泡性树脂组合物中的树脂的总质量,第二树脂的含量优选为40质量%以上100质量%以下,更优选为45质量%以上100质量%以下,进一步优选为50质量%以上100质量%以下。
本实施方式的非发泡性树脂组合物在不损害本发明的效果的范围内,可以包含除第二树脂之外的其他成分(任意成分)。
作为任意成分,可举出:着色剂、阻燃剂、抗氧化剂、紫外线吸收剂、光稳定剂等。
相对于第二树脂100质量份,任意成分的含量优选为50质量份以下,更优选为30质量份以下,进一步优选为20质量份以下。
需要说明的是,非发泡树脂层不需要包含所述发泡剂,但是可以包含所述发泡剂。相对于第二树脂100质量份,非发泡树脂层中包含的发泡剂的量优选为0质量份以上8质量份以下,更优选为0质量份以上5质量份以下,进一步优选为0质量份以上3质量份以下。此外,优选非发泡树脂层中的发泡倍率为0倍,但是1.5倍以下的低发泡的那些也不从本发明排除。
本实施方式的非发泡性树脂组合物可以包含第二树脂和任意成分。非发泡性树脂组合物可以是预先混合所有成分而得到的混合物,也可以是通过成形机内混合所有成分的一部分或全部的方式。预先混合所有成分而得到的混合物可以是粉状,也可以是颗粒状。
本实施方式的非发泡性树脂组合物形成非发泡树脂层,包覆本发明的发泡树脂成形品的外表面。此外,就本实施方式的非发泡性树脂组合物而言,相对于第二树脂的总质量,第二树脂中的橡胶成分的含量为1质量%以上30质量%以下。因此,非发泡树脂层的耐化学品性优异,本发明的发泡树脂成形品的耐化学品性优异。
<发泡树脂成形品的制造方法>
发泡树脂成形品通过注塑成形或挤出成形而制造。
例如,加热熔融发泡性树脂组合物并注塑至金属模具内,在任意的时间任意的温度下进行加热,在任意的时间任意的温度下进行冷却,从而得到具有给定的发泡倍率的发泡树脂成形品。
在挤出成形的情况下,加热熔融发泡性树脂组合物并从挤出机注入金属模具内,在任意的时间任意的温度下进行加热,从而使发泡性树脂组合物发泡·成形。在任意的时间任意的温度下冷却后,切断成给定的长度,从而得到具有给定的发泡倍率的发泡树脂成形品。
在注塑成形机中,即将注塑至金属模具内的发泡性树脂组合物的温度(成形温度)优选为200℃以上280℃以下,更优选为220℃以上260℃以下。当成形温度在所述范围内时,抑制热塑性树脂的热分解而防止透明性的降低,此外,进行充分熔融,得到发泡性树脂组合物的良好的流动性。
在金属模具中进行成形时的时间优选为1分以上10分以下。如果为所述下限值以上,则能够使其充分固化,如果为所述上限值以下,则易于提高发泡树脂成形品的生产性。
以上,虽然详细地说明了本发明的发泡树脂成形品,但本发明不限于所述的一个实施方式,可以在不脱离本发明主旨的范围内适宜变更。
例如,发泡树脂成形品可以不具有非发泡树脂层,而仅为发泡树脂层。在这种情况下,就发泡树脂层而言,相对于第一树脂的总质量,橡胶成分的含量为1质量%以上30质量%以下即可。在发泡树脂成形品仅由发泡树脂层形成的情况下,发泡树脂层的外表面形成与非发泡树脂层同样高密度的层即可。
本发明的发泡树脂成形品由发泡树脂层而形成即可,也可以是进一步具有不同的其他树脂层的多层成形品。作为其他树脂层,除非发泡树脂层之外,可举出:与外表面相同的发泡树脂层、与外表面不同的发泡树脂层。用作这些树脂层的原料的树脂可以是与形成外表面的发泡树脂层相同的热塑性树脂,也可以是不同的热塑性树脂。从抑制树脂层间的剥离的观点出发,优选用作这些树脂层的原料的树脂是与形成外表面的发泡树脂层相同的热塑性树脂。
在发泡树脂成形品为图2所示的发泡管接头(弯头)的情况下,从接受口部20a的接受口端部22a至挡块13a的长度L1与接受口部20a的挡块13a附近的厚度d1的比(以下,也称为“L1/d1比”)优选为3.5以上10以下,更优选为4.0以上9.0以下,进一步优选为4.5以上8.0以下。
当L1/d1比为所述下限值以上时,易于抑制发泡树脂层30侵入接受口部20a,易于抑制接受口部20a的强度的降低。因此,发泡管接头不易因伸缩导致的伸缩疲劳而被破坏。此外,当L1/d1比在所述下限值以上时,由于接受口部20a的长度L1充分长,因此,易于抑制插入发泡管接头中的配管等的插入不足导致的漏水。
当L1/d1比为所述上限值以下时,厚度d1充分厚,发泡管接头不易因伸缩导致的伸缩疲劳而被破坏。此外,当L1/d1比为所述上限值以下时,长度L1不会过长,易于抑制伸缩引起的应力集中在接受口部20a的根部,发泡管接头不易因伸缩导致的伸缩疲劳而被破坏。
需要说明的是,就L1/d1比而言,在发泡树脂成形品1的接受口部20b中也同样。
在发泡树脂成形品为图3所示的发泡管接头(三通)的情况下,从接受口部220a的接受口端部222a至挡块213a的长度L2与接受口部220a的挡块213a附近的厚度d2的比(以下,也称为“L2/d2比”)与所述L1/d1比同样。
就L2/d2比而言,在发泡树脂成形品2的接受口部220b中也同样。
此外,从接受口部220c的接受口端部222c至挡块213c的长度L3与接受口部220c的挡块213c附近的厚度d3的比与所述L1/d1比同样。
作为本发明的发泡树脂成形品,不限于所述的实施方式,可以是螺纹接头、阀座等具有其他形状的发泡管接头。
此外,作为发泡树脂成形品,不限于发泡管接头,可以是通过注塑成形而制造的发泡树脂制的盖、通过挤出成形而制造的发泡树脂制的配管等。
如上所述,由于本发明的发泡树脂成形品具有发泡树脂层,因此,隔热性优异。此外,就本发明的发泡树脂成形品而言,外表面中的橡胶成分的含量比通常的ABS树脂、通常的AES树脂少。因此,本发明的发泡树脂成形品的耐化学品性优异。
实施例
接下来,通过实施例进一步详细地说明本发明,本发明不限于这些实施例。
各实施例和比较例中使用的原料、评价方法如下。
[使用原料]
<第一树脂>
ABS树脂(丁二烯含量15质量%)。
<第二树脂>
ABS树脂(表2~3所述的组成的ABS树脂)。
<其他树脂>
丙烯酸类树脂(聚甲基丙烯酸甲酯)。
<发泡剂>
ADCA(OTSUKA CHEMICAL公司制,商品名“AZ-HM”,偶氮二甲酰胺)。
[实施例1~6]
将聚甲基丙烯酸甲酯混炼至ABS树脂中而得到的树脂组合物作为非发泡性树脂组合物。此时,以使得通过PGC测定非发泡性树脂组合物而得到的各成分的峰面积比变为表2所示的比例而进行混炼。将该非发泡性树脂组合物与作为发泡剂的偶氮二甲酰胺混合而得到的物质作为发泡性树脂组合物,注塑成形,制造接受口部由非发泡树脂层组成并且是实心的、接受口部的内外壁面间的厚度为3mm、接受口部的长度为23mm、主体部的内外壁间的厚度为8mm、具有发泡倍率2.0倍的发泡树脂层的图2所示的内径30mm的DV接头类型的弯头。
[实施例7]
除了将接受口部的长度设为13mm之外,以与实施例6同样的方式制造弯头。
[实施例8]
除了将接受口部的内外壁面间的厚度设为3.2mm、将接受口部的长度设为30mm之外,以与实施例1同样的方式制造弯头。
[实施例9]
除了以使得通过PGC测定非发泡性树脂组合物而得到的各成分的峰面积比变为表3所示的比例进行混炼之外,以与实施例1同样的方式制造弯头。
[实施例10]
除了将接受口部的内外壁面间的厚度设为2.6mm、将接受口部的长度设为30mm之外,以与实施例1同样的方式制造弯头。
[实施例11]
除了将接受口部的内外壁面间的厚度设为5.5mm、将接受口部的长设为18mm之外,以与实施例6同样的方式制造弯头。
[比较例1、2]
除了以使得通过PGC测定非发泡性树脂组合物而得到的各成分的峰面积比变为表3所示的比例而混炼ABS树脂和聚甲基丙烯酸甲酯之外,以与实施例1同样的方式制造弯头。
[耐化学品性的评价]
对于分别在所述实施例、比较例中得到的弯头,将接受口部在管轴方向上切成哑铃形状而得到试验片。将得到的试验片固定于以在23℃的室内施加3MPa的伸缩应力而制备的弯曲夹具上,将用聚乙二醇2mL浸渍的10mm×20mm大小的棉片放置在试验片的中央部。针对各例制备3个试验片,在3个试验片中,将任意的1个放置36小时后,取出棉片并通过肉眼观察而确认。3个试验片中其他2个在放置72小时放置后,取出棉片并通过肉眼观察确认,进行耐化学品性的评价。就耐化学品性的评价而言,试验片有无裂纹根据下述评价基准而进行。结果示于表2~3。
(评价基准)
○:即使在经过72小时后,也没有发生断裂、开裂。
△:在放置时间在1小时以上且小于72小时内发生断裂、裂缝。
×:在放置时间小于1小时内发生断裂、裂缝。
[伸缩疲劳耐性的评价]
如图4所示,使用油压疲劳试验机(岛津制作所公司制一连型疲劳试验机EHF-ED10-70L)300,使制造的弯头3与管道40连接,固定在固定夹具60和固定夹具62上。1秒1次地施加700kg重(6865N)的应力F,在垂直方向上向上拉伸弯头3,进行伸缩疲劳试验。进行伸缩疲劳试验直至弯头3发生伸缩断裂或施加1000次应力F为止,对直至弯头3发生伸缩断裂的应力F施加的次数进行测定。需要说明的是,弯头3具有与图1、2所示的发泡树脂成形品1同样的形状。伸缩疲劳耐性根据下述评价基准而进行评价。结果示于表2~3。
(评价基准)
○:1000次以上。
△:200次以上且小于1000次。
×:小于200次。
如表2~3所示发现,就应用本发明的实施例1~4而言,耐化学品性的评价为“○”,耐化学品性优异。此外,伸缩疲劳试验的结果发现,对于伸缩也具有充分的强度。
发现非发泡树脂层中的橡胶成分(丁二烯)的含量为15质量%以上的实施例5~7、9虽然比实施例1~4差,但是具备耐化学品性和强度。
发现接受口部的长度较长的实施例8虽然比实施例1~4差,但是具备一定程度的强度。
就实施例10和11而言,由于非发泡树脂层中的橡胶成分(丁二烯)的含量为30质量%以下,因此耐化学品性充分,但是由于L1/d1比在所述的优选的范围外,因此,伸缩疲劳耐性较差。
另一方面,橡胶成分的含量在本发明的范围外的比较例1~2的耐化学品性较差。
发现基于本发明的发泡树脂成形品,隔热性和耐化学品性优异。
符号说明
1、2 发泡树脂成形品
3 弯头
10、210 主体部
12a、12b 开口部
13a、213a、213c 挡块
20a、20b、220a、220b、220c 接受口部
22a、222a、222b、222c 接受口端部
212a、212b 开口端部
212c 分支端部
30、230 发泡树脂层
50、250 非发泡树脂层
40 管道
60、62 固定夹具
300 油压疲劳试验机
Claims (2)
1.一种发泡树脂成形品,其具有:
发泡树脂层,其包含第一树脂和发泡剂,所述第一树脂为包含橡胶成分、氰化乙烯基类单体单元和芳香族乙烯基类单体单元的共聚物;和
非发泡树脂层,其包覆所述发泡树脂层,其中,
所述非发泡树脂层包含第二树脂,所述第二树脂为包含橡胶成分、氰化乙烯基类单体单元和芳香族乙烯基类单体单元的共聚物,
相对于所述第二树脂的总质量,通过热解气相色谱质量分析法(PGC/MS)而求得的所述非发泡树脂层的所述橡胶成分的含量为1质量%以上30质量%以下。
2.根据权利要求1所述的发泡树脂成形品,其中,
所述非发泡树脂层进一步包含丙烯酸类树脂。
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JP3699579B2 (ja) * | 1998-01-13 | 2005-09-28 | 積水化学工業株式会社 | 断熱層付き管継手およびその製造方法 |
CN1986635A (zh) * | 2006-12-21 | 2007-06-27 | 中化国际(苏州)新材料研发有限公司 | 一种采用连续本体法制备挤出级丙烯腈-丁二烯-苯乙烯接枝共聚物的方法 |
CN101058624A (zh) * | 2007-05-16 | 2007-10-24 | 中国中化集团公司 | 一种连续本体法制备耐热abs聚合物的方法 |
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JP2020073809A (ja) | 2020-05-14 |
CN111315574B (zh) | 2022-09-20 |
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